5 Pin Din MIDI Female To TRS 3.5mm Male Plug Stereo Jack Audio Adapter Cable 50cm - AliExpress
Metal 6.35mm (1/4in) TRS Stereo Plug to 3.5mm TRS Stereo Jack Adapter, Gold Plated - Monoprice®
Amazon.com: MOBOREST 1/4'' (6.35mm) Male TRS Plug to 1/8'' (3.5mm) Female Socket Stereo Audio Jack Pure Copper Adapter for Headphone, Amp, Adapte - Black 1PCS : Electronics